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An adapting, trait-based ecosystem model for phytoplankton succession Jorn Bruggeman 1, Agostino Merico 2, Ursula Gaedke 3, Bas Kooijman 1, Kai Wirtz 2.

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Presentation on theme: "An adapting, trait-based ecosystem model for phytoplankton succession Jorn Bruggeman 1, Agostino Merico 2, Ursula Gaedke 3, Bas Kooijman 1, Kai Wirtz 2."— Presentation transcript:

1 An adapting, trait-based ecosystem model for phytoplankton succession Jorn Bruggeman 1, Agostino Merico 2, Ursula Gaedke 3, Bas Kooijman 1, Kai Wirtz 2 1 Vrije Universiteit Amsterdam, The Netherlands, 2 GKSS Institute for Coastal Research, Germany, 3 Universität Potsdam, Germany

2 Site: Lake Constance 10 km

3 Site: the ecosystem

4 Site: observations

5 Trait-based model for succession trait abundance trait probability density

6 Linking model and observations bulk variables abundances of individual species field/laboratory bulk variables trait mean and variance trait-based model database parameter values of individual species identify traits and trade-offs reconstruct species abundances

7 speciesmax growth rate (d -1 )PO 4 half sat (µM)length (µm) Dinobryon divergens0.76?? Dinobryon sociale??? Chrysochromulina parva??6 Asterionella formosa Diatoma elongatum?0.020? Fragilaria crotonensis Synedra acus Melosira granulata??24 Stephanodiscus hantzschii1.18?9 Stephanodiscus binderanus??10 Stephanodiscus rotula??26 Ceratium hirundinella0.21?? Peridinium cinctum??27 Chlamydomonas? Pandorina morum??? Chlorella minutissima4.23?? Coelastrum??? Scenedesmus??9 Pediastrum??? Monoraphidium??? Sphaerocystis schroeteri?0.025? Dictyosphaerium pulchellum??? Ulothrix subtilissima??? Closterium aciculare??? Staurastrum cingulum0.82?? Mougeotia thylespora speciesmax growth rate (d -1 )PO 4 half sat (µM)length (µm) Dinobryon divergens Dinobryon sociale Chrysochromulina parva Asterionella formosa Diatoma elongatum Fragilaria crotonensis Synedra acus Melosira granulata Stephanodiscus hantzschii Stephanodiscus binderanus Stephanodiscus rotula Ceratium hirundinella Peridinium cinctum Chlamydomonas Pandorina morum Chlorella minutissima Coelastrum Scenedesmus Pediastrum Monoraphidium Sphaerocystis schroeteri Dictyosphaerium pulchellum Ulothrix subtilissima Closterium aciculare Staurastrum cingulum Mougeotia thylespora Phytoplankton database

8 Identifying traits and trade-offs

9 A single population nutrient effective length - - biomass maintenance biomass mortality phytoplankton zooplankton

10 Seasonal cycle: biomass

11 Seasonal cycle: trait distribution Biomass: Mean ± s.d.: Size distribution:

12 Reconstructing individual species

13 Perspectives Multi-annual time series Vertical space > 1 traits


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